Venting means for pneumatic drills



16, 1930. R. A. NORLING 1,785,527

V VENTIHG MEANS Fon PNEuMAnc-DRILLS .Filed April 25. 1927 1 places inthe drillcase accordingto i p'. Y

tionsof the tools.- The cylinder` andfvalve,

i, bores of themotor open `into* the c rankf and; gear cases,` respectively; and theconipressed Patented f1.6," 1st-9.3()

v REINHo'nD 'KA'. v.1v oRLrtTcQ or'nunoinl,"jiLLINois, Asjsicrigronf'rojfminierininnmriinu-y )Mario Toon company, orgoriioneo,"rntnvois, iacoeiaonarion or DELAWARE -"vQNTLINGJirEANs ritiEriMArIcfiR-ius e This invention relates;4 to {crank} cans-lev ing for rotary pneumatictools,` such las drills, "In tools' of this type, `the crank-and gear 10 in various positions, up," down, horizontal,

and at angles, depending on'theflay-`fthe V work.,V It thereforef follows `that':the.lubri-gi INM '0 Vcant frorn gravityij accunnl'ljl'atesV in air used in operating the tools-leaksinto both cases.V Unlessprevented, there would-bean undesirable accumulation of airA pressure in the AcrankY case. `Shoulda plain holebeniade yinftjhe crankrcasel for venting purposes,jthereVv would always be sonne 'position of. the 'toolf f where the lubricant would cover the hole and 25 be'iforced out of the case aslthe pressure therein increased.` Even infother positions,"the

lubricant would be orcedout of the case with i the'fescapingain as vthe lubricant is churned and becomes aeratedin the operation of theV l Vtooland thus isrea'dilymcarried out with the l escaping air.

Maryam No. 1,591,539, gfnte'auuifa; 1926, to'myself and Axel Levedahl, .discloses t a venting in whichV the air' vent lpassage is V35 formed in the crank` shaft and communicates with the atmosphere through'one end of the shaft, preferably 4vtheupperend, that'is, thef end which is uppermostwhen the'tool is held in a position with `fthe drill bit extending 40 downward.` `l/Vithgthe passage soI provided,

-it must open through the thrustuplate in the Vbearing extension` on the case for the shaft and,as theshaftf in its end play nioves away from, this plate,the lubricant which follows L15 the air is allowed to leak' out of thecase v'about' fof, theflatterrmaybe tightly closed to prevent :leakage about the saine. Bothfapplications v,discloserotary Ameans;V associated iwith the. Vv entsi'or separatingthe lubricant from the escaping airfbycentrifgal action, said'means having' valves iwhichlopen Vand :closel the vent` passagesthrough.theincreaseand decrease of this action. While these valves lghavfe"their. i

advantages, there may I be V-,tirnesI when the .vents afr'e closed,` as whenthe'drill stops'` or uthe seat the reliefvalvelas-inthe.applicationSef l avent nlea'nshaving alloflthe t1ons, butwh1ch1s so made and mounted that no` valve -I'neansf' are required for theV vent passageffeitherrv in connection withV the cen! Y 4trifugalaction' or without it; Thus with the. Q structure of '.this present application, theVv cranlrgcase isfopen at all'times to theatrnos'- es ofr the structures `of said applica'- nobject of thepresent invention `phere, yetlubricantjis separa-ted fromthe escaping air and-retainedfi'n the case; by centrifugal action, aslbeforer 1 f The invention `consistsfurtherinthe rn'atf ters hereinafterV described and claimed. In-'the-accompanyingldrawingse Figflsliows la portablepneumatic drill equipped with a` venting ineansvof'iny presentin-vent'iongf f: "FigtZ isan enlarged Vertical sectional View takenonvline'QQOFig. g3', tojshow the vent;- inglstructuref; andf 'f' l f AFigq` isa similarjsectionalview taken on linessefrigga- The tool shown in lwitha handleQ on one side andfacombned handle "and throttle valvefjS on the opposite' side, "and: through the latter fof which lcompressed-air ysupplied to .the tool for operat- 'ing'itV The spindle tl of thetool leXtendsoutvso lfhas, a inotorcase ward throughthegear case 5v which is bolted tothe Inotorpc'ase 1 lat oneend thereof. The

in tools of. this general design#` At the -op` kpositeenol'olifltheY tool-is slfrzrlciniv,` feed 7, as

customary. j

nurl

ders are arranged V type andin them work Vsingle acting pistons 9 (only one being shown) The pistons are connected by con# necting rods 10, l toa crank shaft-11. The shaft llis offset lto one side oflthespindle .4 and is geared thereto, theigearshbeing 1in the gear case* '5; The ends ef ui@ shaft 11' are journaled in roller bearings vin "tubular cap assemblies 14, 14, adf'lhi'bricantiisprei the ends of the crank shaftffft vented from leaking out oftheials, `1Jbcnitsion 15 Yover whiehis secured aplat'e 16,',w'hichf closes the opening ,A into', the vcasei through said extension. Y The handle 2 iss'crewed into this` extension aty one end oft-he' case, asshown. `Located inl this extension beneath the cover` is a rotary member 17in `the form offa'xkholL low drum and mounted on,,ashaftglV extension, The shaft-,18, held stationary through, said passage opening to'the atmosf phere through the .end ofthe 4shaftopposit'e the pin 19. vApertures 20,20` ingthehollow portion ofthe shaft 18 communicate 'it with the interior 4ofthe drum 17, and the 'latter lhas-arow of apertures 21 Zhen-tendingabout the saine `near the end of1 thedrumnearest The opposite end of thedrum` has'gear teeth 22, which mesh with` av pinion 23 mount- @d 01,1 a 'Stud'.Qe sllpportedY by the, Casel below the extension 15. yThe pinion Ymeshes with a ring gear-'25 vhavinga pressed'pfit on one Qfthe arms2 of the crankshaft 11.

Air leaknglin'to. thases `l @md5 fromjthe pistons and yvalves of the motor,.must pass l'shaft 11,-.1 Thus th lubricant Separated I through the drum 17 to' escape `to the atmosf p here through the ihjo'llofwf@portion 10.f the shaft 18.` As the air ,must first pass Kthrough l the .apertures ,2l toreachthe-ii1teri0f- Q'the drum, any lubricant carried by.V the-jairiwill be brought into jdirect contact vwithflthe, outside'of the drumand be retained in the case .i-bybeingthrownpfthe drumby entrtusel, Aforces set upfas fthe drum is rotated. the

from the escapinglsair and isprevented ,from

, f bein@ .carried thereby out'olf-the case g1.rvr As tuemmimis neared medesime diam'- arms26), thedruin 17, bythegearing described may bero'tatedf faster ,than saidshaftand.

, whenfunder alheavy load. p Y K M l y l-which?l has its.,ends .supported A.in the; walls of the.v

Vits axis substantially parallel to the cranky bit 6 extendingdown, as shown in Fig; 1.l v Thus the air to escape from lthe case 1 must rise to Othe ,uppeilend ofthe icasefandf, supply *lubricant*VK for the upper end of the shaft kand its upper' connecting rodV bearing to Aprevent extensions 12,113 onp1the;;ca'sesfll andm, ree

spectivelyipg These extensions.. are i-tightly, closed over the ends of the shaft k11 by fscrew suchv partsii-imnng jclry'. i,NVhen-,drilling1 upf.. Ward,"1the.t99lis held in;an-.inverted position. Atthis time the drum 17 is at the lower end above the lubricant level in the case when the Y *n i y drillisidletopreventfthe lubricant draining The case lis provided with; asidejeXten-" out :of the case.

:With-thestructure shownfand i described,

noy valves. are requiredto lopenand'. close the vents, `and;.thus the A latter are vopen to vthe yatmosphereatfallftinues ,whether the tool isY running Qfaist .or 'Slow' 4either purposely The ,ldeltails'of structure mayibe variously.y

changed and modified l. without I departingfrom !he spirit" and' scope'of my invention.V

vvIclaiInasany invention.: f -I rotary tol,the coin- Iijallelchtheiiein and having .crankA "arms," a hol! imams. rotatably mounted Within aecas ing4 atf one side. of the ,crank shaft, said ,drum having'ventapertures`and being open Vtothe atmosphere` fthrougli the lcasing for venting` the? same, said Vdrum Ahaving Vgear *teethv about the .`sia1ne.ar ring-gear on one'of thearms of the Crank shaft, andla pinion` withinthe. caslV andjnieshing withsaidv ring gear fandteeth on' the drum, respectively, whereby the drum VVwill.befrotated bythe crank shaft;V 5

'12.. `In a fluid actuated rotarytool, thefcombination with a casing, of acrank shaft ,jour` I nalledftherein and having crankfarms, `a Sec; on'dr shaft .fittedwithin ,the casing at onefsidel ofthe. crank shaft andfhavingfan apertured hollow' portion. openytof they 'atmosphere through the casing kfor venting the same, a

hollowdruinfInounted on said second ,shaft andhaving-,ventlopenings therein, said drumY having gear teeth about the` same, a ring gear ononeofthe armsoffthe -crank shaft, anda pinion within the casing'- 4and ',Ine'shing with the .geaiiand theteeth Aof the. drum, re-

spectively, whereb tatedby the; crank 'shaftfg tion opento the,- atmosphere, at onel vend through the "casing for ventingthe saine, a hollow drumv 1:otavtablylr mounted on said Sejcl ond`shaftandihaying' gear. teethV about the y" the Tfrum Win11( be 'r0.1

c Y 'ond' shaft having an apertured hollow por- Y same adjacent one end and -vent apertures therein'adjacent thev other end5 av ring gear tted to one of the crank 'arms of the crank v Shaft, and a pinion carredvby the casing and meshing with the ring gear `and the@A teeth on thedrum, respectively, whereby the n drumwill be rotated by the crank shaft. Y l

In testimony' whereof I `affix mysignature this 19th day of April,` 1927. 

